{"uid":"cap_uo8lOJ5qv9-HMhwX-pBGM","slug":"market-calendar-api-options-expiration-date-checker-087fba2e","name":"Market Calendar API – Options Expiration Date Checker","description":"Tells whether a date is a US monthly options expiration, triple witching, weekly expiration, VIX expiration or Eurex expiration (holiday-adjusted), and returns the next ones.","url":"https://market-calendar-api.onrender.com/v1/opex?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET","HEAD","DELETE"],"type":"string"},"queryParams":{"type":"object","required":[],"properties":{"date":{"type":"string","description":"Date YYYY-MM-DD. Default: today."}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"down","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_AgJ-wjFjgbkO1i9lAo0Nx","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Checks whether a given date is a US monthly options expiration, triple witching, weekly expiration, VIX expiration, or Eurex expiration (holiday-adjusted), and returns the next upcoming ones.","exampleAgentPrompt":"Is March 21, 2025 a triple witching or monthly options expiration day in the US, and when is the next one coming up after that?","exampleUseCases":[{"title":"Avoid trading on volatile expiry days","prompt":"Can you check if this Friday, June 20, is a triple witching day for US options? I want to know before placing any large trades."},{"title":"Schedule algorithmic strategy around VIX expiry","prompt":"Is July 16, 2025 a VIX expiration date, and if not, when is the next VIX expiry after that date?"},{"title":"Calendar alert for options desk","prompt":"Tell me whether September 19, 2025 is a monthly US equity options expiration or a Eurex expiration, and list the next upcoming expirations of each type."}],"resultDescription":"Returns a structured response indicating whether the queried date is a US monthly options expiration, triple witching date, weekly options expiration, VIX expiration, or Eurex expiration (all holiday-adjusted), along with the next upcoming dates for each expiration type.","failureModes":["Invalid date format returns a 400 error","Date outside supported range may return empty or null expiration flags","Service unavailability on Render free tier may cause timeouts or cold-start delays","Missing date parameter defaults to today, which may be unexpected if a specific date was intended"],"whenToPreferThis":"Choose this endpoint when you need to determine the options expiration type of a specific date (monthly, weekly, triple witching, VIX, Eurex) with holiday adjustment, or need to find the next upcoming expirations. Prefer over generic calendar APIs because it specifically handles US and Eurex derivatives market conventions and holiday-adjusts the dates.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-30T18:27:18.639Z","isFirstParty":false,"canonicalSlug":"market-calendar-api-options-expiration-date-checker-087fba2e"}